Telephone attachment



A. G. SHELILER.

TELEPHONE ATTACHMENT. APPLICATION FILED JULY 20,1920.

1,404,800; Pa ted 173111.31, 1922.

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IN VEN TOR.

A. G. SHELLER.

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Specification of Letters Patent; Patented Jan. 31, 1922.

Application filed July 20, 1920. Serial No. 397,779.

To all whom it may concern Be it known that I, .s-linimn'r G. Suleiman, a citizen of the United States, resioing at Claysville, in the county oi l i ashington and State of Pennsylvania, have invented certain new and useful Improvements in Telephone Attachments,- of which the following is a specification.

This invention relates to a telephone attacliment adapted for us on party lines for the purpose of detecting eaves-dropping or cutting-in on the wire by unauthorized parties.

lit often happens that, on party telephone lines where several parties are included in the same line, curious and unscrupulous persons will listenin on the conversation. It is the object of this invention to provide a means "for attachment to the telephone instruments whereby such listening may be detected and the guilty party identified.

Accordingly, the invention specifically provides a tell and transmitter attachment for telephones actuated by the lifting of the receiver hook so that the sounding of the hell is carried along the wire and by providing different parties with difierent sounding bells the guilty party may be easily located.

In the drawings:

Figure 1 is a perspective view of a telephone instrument having the invention incorporated therein;

Fig. 2 is a detail enlargement, in side ele vation, of the striker mechanism for the alarm bell;

Fig. 3 is a horizontal section on the line 3-3 of Fig. 1.

In detail:

The invention, as herein shown, is applied to the usual box type telephone instrument indicated at A and having the usual transmitter 1, receiver 2 and receiver hook 3. Mounted at the head piece of thetelephone is a supplemental transmitter 4 connected with the wires of the main transmitter 1. Situated approximate the transmitter i is a chime or bell 5 which may either be of the coil type or the usual bell type. A transverse shaft 6 is mounted in bearings 7 and carries a striker arm 8 having a suitable striker end 9 so that oscillation of the transverse shaft 6 will cause the striker to engage its striker end 9 with the chime or hell 5 to sound the same, which sound will be received in the transmitter 4: and carried along the line so that parties talking on the line will know thatanother party whose hell they can identify by sound is listening-in on the conversation. I

For actuating'the bell at the proper time the transverse shaft .6 carries a spring 10 coiled therearound and having one end 11 engaged with one of the bracketsor supports 7 andthe otherend engaged around a detent pin 12. Side frames 13 and 14 of triangular formation and secured in place by screws 15 running through ears 16 provldefa rigld support for the shaft 6 and the parts cooperating therewith, said frames being connected by cross bars 17 and 18. The cross bars 17 and 18 carry a vertical guide bracket 19 which has guide straps 20 receiving and guiding the reciprocable member 21 notched as at 22 for engagement with the detent pin 12, the guide bracket 19 having a similar notch 23 to permit play of the pin. The lower end of the reciprocable bar 21 is provided with a longitudinal slot 24 throughwhich the receiver hook 3 passes so that said bar will follow the movements of the hook.

The removal of the receiver 2 from the receiver hook arm permits the spring-tensioned receiver hook arm 3 to elevate in the usual manner with the result that it carries with it the reciprocable bar 21. As the said reciprocable bar moves upwardly, the detent pin 1.2 is raised and, by reason of its engagement with the inclined wall of the notch 23, is graduallv pushed out of the notch 22, as shown in Fig. 2, and upon clear ing the said notch 22 is returned suddenly, under the tension of spring 10, to the base of the notch 23 thereby causing the striker 8 to sound the chime 5, the sound being carried into the line by the transmitter 4. Upon the replacing of the receiver upon the hook arm 3, the reciprocable member 21 is returned to its normal position and the detent pin 1-2 springs into engagement with the notch,22.

It is to benoted that the mechanism of the attachment is entirely enclosed thereby adjacentsaid supplemental transmitter, av

striker from engagement with said reciprocable means.

2. In combination with a telephone having a receiver and transmitter, a receiver hook carrying the receiver, a bell having a striker, and notched reciprocable means engaging with the receiver hook and cooperating with the bell striker for actuating the latter in one direction, other means for actuating said striker in the opposite direction, and'a cam adapted to release said striker from engagement with said reciprocable means.

3. The combination of a telephone set, of a supplemental transmitter, an audible signal including a bell and a striker arranged slide positively engaged with the receiver hook of the telephone set, a frame in which said striker is mounted to oscillate, a guide for said slide on said frame, an element on said striker engaging with said slide, means for actuating said striker in opposition to said slide, and means fordisengaging said element from said slide at a definite point of its travel.

4. The combination of a telephone set, of a supplemental transmitter, an audible signal including a bell and a striker arranged adjacent said supplemental transmitter, a slide positively engaged with the receiver hook of the telephone set,a frame in which said striker is mounted to oscillate, a guide for said slide on said frame, an element on said striker engaging with said slide, means for actuating said striker in opposition to said slide, and a wedge on said frame adapted to co-operate with said element to disengage the latter from said slide at a definite point of its travel.

In testimony whereof I aflix my signature.

ALBERT G. SHELLER. [1,. s.] 

